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P A. M. JOLIVETTB HAND 0R MAN HOLE COVER. APPLICATION FILED SEPT.8,1915- 1 1 94,295 Patented Aug. 8, 1916.

z- ,1 my! emu m ARCHIE M. JOLIVETTE, OF GREENFIELD, MASSACHUSETTS.

HAND 0R MAN HOLE COVER.

Application filed September 8, 1915.

To all whom it may concern Be it known that I, Anorim M. Jonryn'r'rn, acitizen of the United States, resldmg at Greenfield, in the county ofFranklin and State of Massachusetts, have invented certain new anduseful Improvements in Hand or Man Hole Covers; and I dohereby declarethe following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

My invention relates to improvements in hand or manhole closures forsteam boilers, tanks, or other like vessels, and it is intended toprovide a simplified form of construction which will adapt itself to theconditions required, and -may be readily applied or removed as desired.

My invention comprises a cast metal plate recessed to receive the innerend or head of a T-shaped bolt, and consists of certain novel featureswhich will be hereinafter described; reference being had to theaccompanying drawings, in which the same parts are indicated by similarreference symbols through out the several views Figure 1 is a frontelevation of the manhole plate in place, showing the yoke and bolt insection along the line 1-1 of Fig. 2, and looking in the direction ofthe arrows; Fig. 2 shows a section along the line 22 of Fig. 1 lookingdown, parts being shown in elevation and parts broken away; Fig. 3

is a detail showing the chambered plate or cover; and Fig. 4 is a detailshowing one of the bolts with the elongated heads used in combinationwith the plate.

A represents a boiler having the usual manhole or hand hole a and Brepresents the manhole plate or cover which is preferably in ellipticalform, as shown, the outer ellipse B being larger than the ellipticalboss B which isconcentric therewith, and exterior to this boss B is aplain surface I) for the gasket C.

The ellipticalboss B is provided with an elongated recess bprojectingdown to the plane of the face 7), and opening outward through the sidesof the'elliptical boss are two wing chambers b and b in the staggeredrelation as shown in Figs. 1 and 3.

The bolt D is provided with the usual washer (Z and usual nut 03, andhas on its inner end an elongated head D, which is substantiallyrectangular in form, as shown in Figs. 1 and 4.

Specification of Letters Patent.

Patented Aug. 8, 1916.

Serial No. 49,595.

E represents the yoke of any suitable or desired construction.

To apply the device the head D of the bolt is inserted in therectangular recess 1) and is then turned in clockwise direction toengage in the wing chambers 12 and 79 this turning movement beingarrested by the walls 5 and b of said wing chambers. Now

the cover may be very readily inserted in the opening a, and the yoke,washer and nut -may be readily applied.

To. remove the parts apply a wrench in the usual way to the nut dtending to unscrew the same, and if this nut is rusted to vthe screw asfrequently happens, before the nut will yield the bolt will itself turnuntil the head D of the bolt will register with the opening 6 in theplate, and the bolt may be readily withdrawn and with it the yoke E,leaving the plate in place to be removed by hand.

It is not necessary to have any special nice adjustment of the parts, asit is desirable to have the bolt free to move slightly 1n any.direction, permitting the whole yoke and plate to line up properlyagainst the boiler shell. For this reason there should be a loose fitbetween the head of the bolt and the recess 6 and the wing chambers band b and also between the bolt and the yoke.

It will'be obvious that the bolts can be easily renewed in old plates,and much time can be saved in removing all the parts from the boiler. Itwill also be seen that it will not be necessary to cut the nuts ofi? indark and cramped quarters, as frequently happens with the present styleof bolt.

To operate the device only the usual wrench is needed, and if the nutsticks fast it can be very readily loosened where there are suitablefacilities for so doing and where there is plenty of elbow room.

I/Vhile I have shown the bolt head and recess and wing chambers asrectangular in shape, and I prefer that they should be substantiallyrectangular, it will be obvious that other suitable shapes may beadopted, if desired.

It will be obvious that the hand or manhole closures constructed ashereinbefore described may be very quickly and conveniently applied andreadily and conveniently removed when desired.

While the device is especially adaptable for manhole closures, it isalso applicable to hand hole closures and I do not mean to limit theinvention to any particular closure for an opening in any particularvessel adapted to withstand steam or other fluid pressure.

Having thus described my invention What I claim and desire to secure byLetters Patent of the United States is 1. In a man or hand hole closurefor boilers,'the combination with an elliptical plate provided with anelliptical boss projecting inwardly therefrom, and a bearing surface forthe gasket exterior to said elliptical boss,

the said boss having a rectangular central recess in the inner wallthereof and two laterally-disposed wing chambers opening through thesides of said boss arranged in staggered relation and connectedinteriorly with said central recess, of a T-shaped locking bolt providedwith a laterally elongated rectangular head adapted to pass through saidrecess, and to engage, when turned through an angle, with saidlaterallydisposed wing chambers, and means for connecting said bolt tothe boiler, substantially as described.

2. In a man or hand hole closure for boilers, the combination with anelliptical plate provided with an elliptical boss projecting inwardlytherefrom, and'a-bearing surface for the gasket exterior to saidelliptical boss, the said boss having a rectangular central recess inthe inner wall thereof and two laterally-disposed wing chambers openingthrough the sides of said boss arranged in staggered relation andconnected interiorly with said central recess, of a T-shaped lock:

ing bolt provided with a laterally elongated" rectangular headadapted'to pass through said recess, and to engage, when turned throughan angle, with said laterally-disposed wing chambers, and a yoke and nutfor connecting said bolt to the boiler, substantially as described.

In testimony whereof, I aflix my signature.

ARCHIE M. J OLIVETTE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner ,of Patents,

Washington, D. C.

